31403143 has 8 divisors (see below), whose sum is σ = 34196400. Its totient is φ = 28723968.

The previous prime is 31403137. The next prime is 31403147. The reversal of 31403143 is 34130413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31403143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31403143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27946 + ... + 29047.

It is an arithmetic number, because the mean of its divisors is an integer number (4274550).

Almost surely, 2^31403143 is an apocalyptic number.

31403143 is a deficient number, since it is larger than the sum of its proper divisors (2793257).

31403143 is a wasteful number, since it uses less digits than its factorization.

31403143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57041.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 31403143 is about 5603.8507296323. The cubic root of 31403143 is about 315.4939524979.

Adding to 31403143 its reverse (34130413), we get a palindrome (65533556).

The spelling of 31403143 in words is "thirty-one million, four hundred three thousand, one hundred forty-three".